Investigation on standard entropy change of metal hydrides and work function of metals

We focused on the work function of metals as an index of ion binding property between metals and hydrogen and analyzed the relation between the standard entropy change of metal hydrides and the work function of metals (alloys). The standard entropy change of saline hydrides and metallic hydrides roughly increased with the work function. It was indicated that hydrogen storage alloys consist of metal elements A and B whose work functions are small and large, respectively. The standard entropy changes of alloy-based metal hydrides with different composition ratio ΔS⁰ linearly increased with the work functions of the alloys W_c. W_c also linearly increased with the bulk modulus B_c. Then, it was found that ΔS⁰ was proportional to the standard heat of formation ΔH⁰ because dW_c/dB_c, dΔS⁰/dW_c and dΔH⁰/dB_c are constant.     

Finite difference analysis for entropy optimized flow of Casson fluid with thermo diffusion and diffusion-thermo effects

Heat transportation is a novel prospective in many thermal processes and presents dynamic applications in industrial and thermal polymer processing optimization. The importance of heat transportation is noted in heat exchangers, production of crude oils, combustion, petroleum reservoirs turbine systems, thermal systems, porous media, modeling of resin transfer nuclear reactions etc. In view of such thermal applications the main objective here is to examine entropy in unsteady magnetohydrodynamic of Casson fluid flow. Radiation in addition to dissipation and ohmic heating are analyzed. Entropy is scrutinized employing thermodynamic second law. Characteristics of Soret and Dufour are also examined. Main objective here is to examine irreversibility. Dimensionless version of differential system is obtained through suitable variables. The obtained partial differential system is solved through numerical scheme (Finite difference method). Physical features of fluid flow, temperature, entropy optimization and concentration have been explained. Variations of parameters on drag force, Nusselt number and solutal transfer rate are graphically discussed. Higher fluid parameter leads to improve in velocity and entropy rate. Larger values of radiation parameter boost up thermal field. Entropy rate and velocity have reverse trend for magnetic field. An intensification for concentration is found through Soret number. Higher approximation of Reynold number enhances skin friction and velocity. Thermal transfer rate is augmented versus radiation and magnetic variables.     

用熵权法和主成份投影法优选PDC钻头

针对深井、超深井深部井段钻井提速难题,可通过优选PDC钻头提高钻进速度、降低钻井成本。为了全面、客观地评价钻头性能的优劣,文在选取纯钻时间、机械钻速、进尺等钻头性能评价指标的基础上,采用熵权法对各评价指标赋权,应用主成份投影法对某油田PDC钻头性能进行评价并优选PDC钻头。采用优选出的PDC钻头,试验井平均机械钻速比邻井同组地层提高了15%,表明钻头选型方法合理,可用来优选和评价PDC钻头     

建设项目投资方案优选的熵权系数法

本文根据熵的概念 ,把建设项目投资方案多目标决策问题中的固有信息与决策者经验判断的主观信息进行量化与综合 ,进而建立了基于熵权的建设项目投资方案多目标优序评价模型 ,最后通过实例计算 ,说明该模型结构严谨、物理意义明确 ,决策结果更加合理、符合实际。     

走向可持续发展的城市规划

论述了了持续是未来城市发展的必然选择及其与城市规划的结合问题。用持续发展观重新审视了城市规划中“理性”和“人性”这一基本问题；提出了持续发展的系统观、生态观和技术框架；并提出了持续发展的“四维”城市规划观。     

新型智能预装式变电站状态评价关键参量研究

研究了预装式变电站主要设备的关键状态参量,建立了配电变压器状态评价模型,利用状态评价模型进行了实例分析,给出了分析结果。     

云计算平台中分布式Hadoop数据挖掘关键技术研究

云计算环境下的大数据特征挖掘是大数据统计及分析的基础。为了提高聚类的准确度和速度,设计了一种基于分布式Hadoop平台和熵加权特征选择的数据挖掘方案。该方案首先采用无回路有向图对Hadoop平台下的Map Reduce 作业流调度问题进行了分析。然后采用并行 Map Reduce执行过程完成分布式计算。最后,采用熵加权聚类算法实现海量数据挖掘。仿真结果显示,提出的数据挖掘方案具有较好聚类效果和运行效率。     

基于熵权与TOPSIS融合法的绿色刀具制造方案评估模型研究

基于绿色制造理念的刀具方案评估是推动机械加工行业实现绿色制造的重要措施。针对现有面向绿色制造的刀具方案评价研究中评价指标权重确定方面存在的不足,提出了一种新的熵权法和TOPSIS法相结合的绿色制造刀具方案评估方法。首先建立了多层次的绿色制造刀具方案评估指标体系,在此基础上,将熵权法与TOPSIS法相结合建立了基于熵权TOPSIS法的绿色制造刀具方案评估模型。最后通过方案评估实例验证了所建立的绿色制造刀具方案评估模型是合理有效的。     

基于组合赋权-集对分析的煤矿煤尘爆炸危险性评价研究

针对目前煤尘爆炸危险性评价研究较少、各评价因素选择偏差较大的问题,通过分析煤尘爆炸特性,提出以煤尘可爆性危险、煤尘爆炸浓度危险、点火源危险3个必要条件为一级指标,煤质变异程度、挥发分、水分、灰分等14个二级指标,以层次分析法确定各指标的主观权重,以熵权法确定各指标的客观权重,利用乘法归一化方法对各指标的组合权重进行计算,构建集对分析-组合赋权煤尘爆炸危险性评价模型,并将该模型与已较成熟的改进FAHP模型、模糊事故树模型、灰色聚类评估体系、未确知测度评价模型一同应用于济宁某矿的煤尘爆炸危险性评价过程中,结果显示:集对分析-组合赋权评价模型、改进FAHP模型、灰色聚类评估体系评价结果为一般危险等级,模糊事故树模型的评价结果为较安全等级,集对分析-组合赋权煤尘爆炸危险性评价模型评价结果与改进FAHP模型、灰色聚类评估体系、未确知测度评价模型的评价结果一致,该模型对煤尘爆炸危险的评价具有较好的适用性。     

Ordering Method and Empirical Study on Multiple Factor Sensitivity of Group Social Attitudes Based on Entropy Theory

When studying the various factors affecting a group’s social attitudes, minor changes in a factor will easily cause changes to other factors due to their association and relevance to each other; therefore, such a factor is more sensitive, although there is a difference between sensitivity and importance. In order to comprehensively learn about the influence of multiple factors, explorations based on entropy theory have been conducted to determine the sensitivity of each factor, to specify the difference between the frequency and sensitivity priority of entropy theory, and to provide a method, a way of thinking, and a detailed basis for the resolution of actual problems.